Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings (Deficit) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |
Beginning balance at Dec. 31, 2017 | $ 1,185 | | $ 2,019 | $ (730) | $ (105) |
Beginning balance, shares at Dec. 31, 2017 | | 108,030 | | | |
Beginning balance, Common stock value at Dec. 31, 2017 | | $ 1 | | | |
Net income | 2 | | | 2 | |
Stock-based compensation | 4 | | 4 | | |
Vesting of restricted stock, shares | | 158 | | | |
Shares withheld for taxes, shares | | (47) | | | |
Other comprehensive income | 1 | | | | 1 |
Ending balance at Mar. 31, 2018 | 1,192 | | 2,023 | (728) | (104) |
Ending balance, shares at Mar. 31, 2018 | | 108,141 | | | |
Ending balance, Common stock value at Mar. 31, 2018 | | $ 1 | | | |
Beginning balance at Dec. 31, 2017 | 1,185 | | 2,019 | (730) | (105) |
Beginning balance, shares at Dec. 31, 2017 | | 108,030 | | | |
Beginning balance, Common stock value at Dec. 31, 2017 | | $ 1 | | | |
Net income | 16 | | | | |
Ending balance at Jun. 30, 2018 | 1,189 | | 2,026 | (714) | (124) |
Ending balance, shares at Jun. 30, 2018 | | 108,391 | | | |
Ending balance, Common stock value at Jun. 30, 2018 | | $ 1 | | | |
Beginning balance at Mar. 31, 2018 | 1,192 | | 2,023 | (728) | (104) |
Beginning balance, shares at Mar. 31, 2018 | | 108,141 | | | |
Beginning balance, Common stock value at Mar. 31, 2018 | | $ 1 | | | |
Net income | 14 | | | 14 | |
Stock-based compensation | 4 | | 4 | | |
Exercise of stock options, shares | | 3 | | | |
Vesting of restricted stock, shares | | 328 | | | |
Shares withheld for taxes | (1) | | (1) | | |
Shares withheld for taxes, shares | | (81) | | | |
Other comprehensive income | (20) | | | | (20) |
Ending balance at Jun. 30, 2018 | 1,189 | | 2,026 | (714) | (124) |
Ending balance, shares at Jun. 30, 2018 | | 108,391 | | | |
Ending balance, Common stock value at Jun. 30, 2018 | | $ 1 | | | |
Beginning balance at Dec. 31, 2018 | 1,214 | | 2,034 | (678) | (143) |
Beginning balance, shares at Dec. 31, 2018 | | 108,427 | | | |
Beginning balance, Common stock value at Dec. 31, 2018 | 1 | $ 1 | | | |
Net income | 18 | | | 18 | |
Stock-based compensation | 4 | | 4 | | |
Exercise of stock options | 1 | | 1 | | |
Exercise of stock options, shares | | 70 | | | |
Vesting of restricted stock, shares | | 305 | | | |
Shares withheld for taxes | (2) | | (2) | | |
Shares withheld for taxes, shares | | (93) | | | |
Other comprehensive income | 10 | | | | 10 |
Ending balance at Mar. 31, 2019 | 1,245 | | 2,037 | (660) | (133) |
Ending balance, shares at Mar. 31, 2019 | | 108,709 | | | |
Ending balance, Common stock value at Mar. 31, 2019 | | $ 1 | | | |
Beginning balance at Dec. 31, 2018 | 1,214 | | 2,034 | (678) | (143) |
Beginning balance, shares at Dec. 31, 2018 | | 108,427 | | | |
Beginning balance, Common stock value at Dec. 31, 2018 | 1 | $ 1 | | | |
Net income | 32 | | | | |
Other comprehensive income | | | | | 11 |
Ending balance at Jun. 30, 2019 | 1,264 | | 2,041 | (646) | (132) |
Ending balance, shares at Jun. 30, 2019 | | 108,796 | | | |
Ending balance, Common stock value at Jun. 30, 2019 | 1 | $ 1 | | | |
Beginning balance at Mar. 31, 2019 | 1,245 | | 2,037 | (660) | (133) |
Beginning balance, shares at Mar. 31, 2019 | | 108,709 | | | |
Beginning balance, Common stock value at Mar. 31, 2019 | | $ 1 | | | |
Net income | 14 | | | 14 | |
Stock-based compensation | 4 | | 4 | | |
Exercise of stock options, shares | | 20 | | | |
Vesting of restricted stock, shares | | 68 | | | |
Shares withheld for taxes, shares | | (1) | | | |
Other comprehensive income | 1 | | | | 1 |
Ending balance at Jun. 30, 2019 | 1,264 | | $ 2,041 | $ (646) | $ (132) |
Ending balance, shares at Jun. 30, 2019 | | 108,796 | | | |
Ending balance, Common stock value at Jun. 30, 2019 | $ 1 | $ 1 | | | |